This refrigeration cycle apparatus is provided with: a refrigerant circuit that is provided with a compressor, a condenser, a diaphragm device, and an evaporator; a light-emitting unit that emits light and that is provided to a flow passage leading to the evaporator, the compressor, and the condenser in the refrigerant circuit; a photodetection sensor that detects the light from the light-emitting unit and that is provided together with the light-emitting unit; a control device that determines whether freezer oil in the refrigerant circuit has degraded or whether the compressor has been damaged, on the basis of the detection result of the photodetection sensor; and a notification unit that notifies whether the freezer oil in the refrigerant circuit has degraded or whether the compressor has been damaged.